Hydraulic jig for correction of mis-alignment between joints of plates

ABSTRACT

A hydraulic jig for correction of mis-alignment between joints of flat plates wherein the joints are clamped by a plurality of hydraulic jacks utilizing a plurality of holes opened in the plates, and the correction of mis-alignment between the joints can be corrected with a plurality of other hydraulic jacks and backing straps.

United States Patent [191 Une et a1. Apr. 30, 1974 4] HYDRAULIC JIG FOR CORRECTION OF [56] References Cited MIS-ALIGNMENT BETWEEN JOINTS OF UNITED STATES PATENTS PLA 1,604,483 10/1926 Roberts 29/200 .1 [75] Inventors: Tatuyuki Une, Hiroshima-ken; 3,421,677 H1969 Jenkins Akira Kamata, T ky -to, both of 3,647,131 3/ 1972 Hahne 228/5 Japan i Primary Examiner-Roy Lake k [73] Asslgnees zggigz g g gsi zg; gg Assistant Examiner-Ne1l Abrams Kabushiki Kaishaosaka Jack Attorney, Agent, or Firm-Scrivener Parker Scrivener Seisakusho, Osaka-shi, Osaka-fu, & Clarke both of, Japan 22 Filed: Feb. 22, 1972 [57] ABSTRACT [2!] App] 227 904 A hydraulic jig for correction of mis-alignment between joints of flat plates wherein the joints are [30] 1 Foreign Application priority Data clamped by a plurality of hydraulic jacks utilizing a b 23 1971 J 46 10803 plurality of holes opened in the plates, and the correc- Fe apan tion of mis-alignment between the joints can be corrected with a plurality of other hydraulic jacks and [52] US. Cl. 29/200 P, 228/44, 2266942177, backing Straps. 1 I 51 Int. Cl B23k 19/00 7 [58] Field of Search 29/200 P, 200 J, 493; 2 Claims, 5 Drawing Figures ATENTED APR 3 O ISM SHEET 1 OF 2 IATENTEUAPR 30 m4 SHEET 2 [IF 2 HYDRAULIC JIG FOR CORRECTION OF MIS-ALIGNMENT BETWEEN JOINTS OF PLATES Recently larger and larger vessels are built so that the conventional manual operation for joining the shell blocks or subassemblies becomes extremely difficult.

In the prior art method, a large number of misalignment pieces are used for correction of misalignment, and erection is accomplished by hammers and wedges. Therefore, the defects of the prior method are that the cost becomes higher, a large number of materials are used; a long time is required to attach the pieces; the consumption of welding rods and electric power is increased; and the spots at which the pieces are attached must be finished after welding.

The present invention was made to overcome these defects described above, and provides a hydraulic jig for correction of mis-alignment between the joints of plates characterized in that two jig beams are provided so that the plates to be joined may be clamped from both sides thereof with hydraulic jacks and by utilizing a plurality of holes drilled in said plates whose joints are to be aligned; and a plurality of hydraulic jacks for pressing said plates against a plurality of backing straps attached to one of said jig beams so as to correct misalignment between the joints of said plates are mounted on the other jig beam.

The present invention will become more apparent from the following description of the preferred embodiment thereof taken in conjunction with the accompanying drawing.

FIG. 1 is a top view of a jig of the present invention used for correction of mis-alignment between the joints; FIG. 2 is a front view thereof; FIG. 3 is a sectional view taken along the lines A-A of FIG. 1; FIG. 4 is a side view looking in the direction indicated by the arrows B of FIG. I; and FIG. 5 is a fragmentary transverse sectional view of a transverse frame in a vessel.

The embodiment is for correcting mis-alignment between web plates 1 and l of transverse frame in a vessel as shown in FIG. 5.

As shown in FIG. 2, a frame 5 carries a pair of 6-ton hydraulic jacks 3 for clamping and one 2-ton hydraulic jack 4 for correction of mis-alignment. A plurality of such frames 5 similar in construction are spaced apart from each other on a beam 2 ofajig in the longitudinal direction thereof. A plurality of 2-ton hydraulic jacks 4 are also attached on the beam 2 in spaced apart relation. A backing pad or strap 7 for correction of misalignment is disposed in opposed relation with the hydraulic jack 4 mounted on the frame 5. Another jig beam 6 having a plurality of frames 8 disposed in opposed relation with the frames 5 on the jig beam 2 is provided. Holes 10, 75 80 mm in diameter are drilled in the web plate 1 at the positions at which the hydraulic jacks 3 are placed when the jig beam 2 with the construction described above is placed in front of the joint 12 of the web plate 1, so that the rods 1 1 of the hydraulic jacks 3 may extend through the holes 10 beyond the web plate 1 and be coupled to the frames 8 of the jig beam 6 with pins 9 as best shown in FIG. 3. Thus the web plates 1 and l are sandwiched between the pair ofjig beams 2 and 6, and the mis-alignment in the joint 12 can be corrected with the hydraulic jacks 4 and the backing straps 7.

To correct mis-alignment between the web plates 1, the jig beam 2 is placed in front (bow of fore) of the joint 12 between the web plates 1, whereas the jig beam 6 is placed on the back (stem or aft) side of the joint by using suitable lifts. Next the rods of the hydraulic jacks 3 on the jig beam 2 are extended through the holes 10 in the web plates 1 and connected to the frames 8 of the jig beam 6 with the pins 9 as best shown in FIGS. 1 and 3. Thus the jig beams 2 and 6 are coupled to each other with the web plates 1 sandwiched therebetween.

Next the liquid under pressure is fed to the hydraulic jacks 3 to withdraw the rods 11, whereby the jig beams 2 and 6 are clamped together with the pins 9 and the frames 8. Thereafter the hydraulic jacks 4 for correction of mis-alignment are actuated to correct the misalignment of the joint 12, and then the tack welding and joint welding are accomplished.

In the above embodiment, the present invention has been described as being applied to the web plates of the transverse frame in a vessel, but it should be understood that the jig of the present invention may be also applied to web plates used in the structures other than vessels. Various modifications and variations of the jig device can be effected without departing from the scope of the present invention.

As described above, according to the present invention, the joints between flat plates are clamped by a plurality of hydraulic jacks utilizing a plurality of holes drilled in the plates in the manner described above, and the mis-alignment between the joints can be corrected with a plurality of other hydraulic jacks and the backing straps. The correctionof misalignment can be accomplished in a simple manner, and the need of a large quantity of mis-alignment correction pieces can be eliminated. Thus the defects of the prior art described hereinbefore can be overcome. The operation can be accomplished within a short time in a very efficient and simple manner.

We claim:

1. Ajig for aligning a pair of plates edge to edge prior to welding, comprising: two elongate jig beams between which a margin of one of said plates may be held with an edge projecting, and a plurality of hydraulic jacks, some of said jacks being arranged in pairs and arranged to hold the beam together and the remaining jacks being spaced along one of said beams and acting against backing pads equivalently spaced along the other beam to grip, and adjust the position of, the margin of the other of said plates whereby the plates may be brought edge to edge for welding, a plurality of frames spaced along the beams, each frame possessing a first portion attached to one beam and a second portion attached to the other beam; each frame holding one of said pairs of jacks with the body of each jack on one frame portion and the jack rod of each jack on the other frame portion, whereby the rods can be passed through correspondingly spaced holes in the margins of the respective plates and upon contraction the jacks move the beams together.

2. A jig for aligning a pair of plates edge to edge prior to welding, comprising: two elongate jig beams between which a margin of one of said plates may be held with an edge projecting, and a plurality of hydraulic jacks, some of said jacks being arranged in pairs and arranged to hold the beams together and the remaining jacks being spaced along one of said beams and acting against backing pads equivalently spaced along the other beam to grip, and adjust the position of, the marother frame portion, whereby the rods can be passed through correspondingly spaced holes in the margins of the respective plates and uponcontraction the jacks move the beams together wherein some of said remaining jacks and their backing pads are arranged on said frames. 

1. A jig for aligning a pair of plates edge to edge prior to welding, comprising: two elongate jig beams between which a margin of one of said plates may be held with an edge projecting, and a plurality of hydraulic jacks, some of said jacks being arranged in pairs and arranged to hold the beam together and the remaining jacks being spaced along one of said beams and acting against backing pads equivalently spaced along the other beam to grip, and adjust the position of, the margin of the other of said plates whereby the plates may be brought edge to edge for welding, a plurality of frames spaced along the beams, each frame possessing a first portion attached to one beam and a second portion attached to the other beam; each frame holding one of said pairs of jacks with the body of each jack on one frame portion and the jack rod of each jack on the other frame portion, whereby the rods can be passed through correspondingly spaced holes in the margins of the respective plates and upon contraction the jacks move the beams together.
 2. A jig for aligning a pair of plates edge to edge prior to welding, comprising: two elongate jig beams between which a margin of one of said plates may be held with an edge projecting, and a plurality of hydraulic jacks, some of said jacks being arranged in pairs and arranged to hold the beams together and the remaining jacks being spaced along one of said beams and acting against backing pads equivalently spaced along the other beam to grip, and adjust the position of, the margin of the other of said plates whereby the plates may be brought edge to edge for welding, a plurality of frames spaced along the beams, eAch frame possessing a first portion attached to one beam and a second portion attached to the other beam; each frame holding one of said pairs of jacks with the body of each jack on one frame portion and the jack rod of each jack on the other frame portion, whereby the rods can be passed through correspondingly spaced holes in the margins of the respective plates and upon contraction the jacks move the beams together wherein some of said remaining jacks and their backing pads are arranged on said frames. 